Added propper support for Lets split vitamins (#2559)

* Added support for the upcomming Lets_split vitamins included

* Updated readme

* Corrected header of readme

* Enabled RGB

* Broke everything

* broke some more shit

* Revert "broke some more shit"

This reverts commit 6ad68e6269cc0d04c16564ce9598dfd3db1e23c1.

* Revert "Broke everything"

This reverts commit feeee4e40db15a726f2292b6a9406ef45c1e54a7.

* Fixed USB detection, and RGB on slave

* started modifying readme, to use msys2

* Added support for the upcomming Lets_split vitamins included

* Updated readme

* Corrected header of readme

* Enabled RGB

* Broke everything

* broke some more shit

* Revert "broke some more shit"

This reverts commit 6ad68e6269cc0d04c16564ce9598dfd3db1e23c1.

* Revert "Broke everything"

This reverts commit feeee4e40db15a726f2292b6a9406ef45c1e54a7.

* Fixed USB detection, and RGB on slave

* started modifying readme, to use msys2

* Updated readme to reflect use of msys2 Added avrdude to msys path

* added avrdude option to msys installer

* Removed extra installation of avrdude

* Renamed to vitamins_included and implemented drashnas changes

* Fixed include guard

* Fixed some includes, and added avrdude target to docs.

* Fixed default keyboard

1 files changed, 50 insertions, 0 deletions

diff --git a/keyboards/vitamins_included/i2c.h b/keyboards/vitamins_included/i2c.h
new file mode 100644
index 000000000..739d134be
--- /dev/null
+++ b/keyboards/vitamins_included/i2c.h
@@ -0,0 +1,50 @@
+#ifndef I2C_H
+#define I2C_H
+
+#include <stdint.h>
+#include "split_util.h"
+
+#ifndef F_CPU
+#define F_CPU 16000000UL
+#endif
+
+#define I2C_READ 1
+#define I2C_WRITE 0
+
+#define I2C_ACK 1
+#define I2C_NACK 0
+
+#define SLAVE_BUFFER_SIZE 0x10
+
+// i2c SCL clock frequency
+#define SCL_CLOCK  400000L
+
+extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
+
+void i2c_master_init(void);
+uint8_t i2c_master_start(uint8_t address);
+void i2c_master_stop(void);
+uint8_t i2c_master_write(uint8_t data);
+uint8_t i2c_master_read(int);
+void i2c_reset_state(void);
+void i2c_slave_init(uint8_t address);
+
+
+static inline unsigned char i2c_start_read(unsigned char addr) {
+  return i2c_master_start((addr << 1) | I2C_READ);
+}
+
+static inline unsigned char i2c_start_write(unsigned char addr) {
+  return i2c_master_start((addr << 1) | I2C_WRITE);
+}
+
+// from SSD1306 scrips
+extern unsigned char i2c_rep_start(unsigned char addr);
+extern void i2c_start_wait(unsigned char addr);
+extern unsigned char i2c_readAck(void);
+extern unsigned char i2c_readNak(void);
+extern unsigned char i2c_read(unsigned char ack);
+
+#define i2c_read(ack)  (ack) ? i2c_readAck() : i2c_readNak();
+
+#endif